Kaltura_Client_Exception thrown

Invalid KS "Yzc5MGM1MzdiZDUzN2ViZTg1NjFlODE1N2IwYjUzNGVmODljNTYzNnwxMDE7OzE0NzUwMDUzOTc7MjsxNDc0OTE4OTk3Ljk0MDc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"